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WPF 使用 DI EF CORE SQLITE

news 来源：原创 2025/6/22 6:28:53

WPF 使用 DI EF CORE SQLITE

1.安装 nuget包

<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.4" />

2.创建DbContext的实现类，创建有参构造函数

  public XXContext(DbContextOptions<XXXContext> options) : base(options){}

不创建有参构造函数会注入会报下面的错误

ArgumentException: 'AddDbContext' was called with configuration, but the context type 'XXContext' only declares a parameterless constructor. This means that the configuration passed to 'AddDbContext' will never be used. If configuration is passed to 'AddDbContext', then 'XXContext' should declare a constructor that accepts a DbContextOptions<XXContext> and must pass it to the base constructor for DbContext.

3.appsettings.json 配置文件中增加配置项

{"ConnectionStrings": {"XXContextSQLite": "Data Source=XX.db"}}

4.在主机配置中增加配置

    private static readonly IHost _host = Host.CreateDefaultBuilder()//.ConfigureLogging(config => { config.AddConsole(); }).ConfigureServices((context, services) =>{services.AddSingleton<INavigationService, NavigationService>();services.AddSingleton<MainWindow>();services.AddSingleton<MainWindowViewModel>();services.AddDbContext<XXContext>(options =>options.UseSqlite(context.Configuration.GetConnectionString("XXContextSQLite")));}).Build();

5.生成数据库

主机启动后执行 context.Database.EnsureCreated();

会创建配置文件中配置的数据库

 _host.Start();using (var scope = _host.Services.CreateScope()){var services = scope.ServiceProvider;var context = services.GetRequiredService<XXContext>();context.Database.EnsureCreated();// DbInitializer.Initialize(context);}

6.种子数据

在DbContext 实现类中重写 OnModelCreating 方法

 protected override void OnModelCreating(ModelBuilder modelBuilder){modelBuilder.Entity<Channel>().HasData(new Channel { ID = 1, ChanelNum = "D1", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 2, ChanelNum = "D2", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 3, ChanelNum = "D3", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 4, ChanelNum = "D4", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 5, ChanelNum = "D5", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 6, ChanelNum = "D6", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 7, ChanelNum = "D7", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 8, ChanelNum = "D8", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 9, ChanelNum = "D9", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 10, ChanelNum = "D10", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 11, ChanelNum = "D11", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 12, ChanelNum = "D12", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 13, ChanelNum = "D13", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 14, ChanelNum = "D14", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 15, ChanelNum = "D15", ChannelName = String.Empty, CreateTime = DateTime.Now },new Channel { ID = 16, ChanelNum = "D16", ChannelName = String.Empty, CreateTime = DateTime.Now });}